Magphan RT - The Phantom Laboratory

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Magphan RT

Magphan RT - The Phantom Laboratory

MRI manufacturers have made great strides in reducing MR system distortion. Maintaining acceptable levels of distortion relies on properly controlling a long chain of conditions. It is critical to have a robust system of quality control for key imaging performance characteristics in order to detect significant deviations before they affect clinical operations.

PHANTOM DESIGN

Magphan® RT meets the specific QA needs for MR imagers used for MR guided surgery and radiotherapy planning and guidance where measurement of large fields of view are required for torso sizes encountered in clinical practice.

Magphan® RT 820

The Magphan® RT 820 has a two-piece configuration (top and bottom) that measures geometric distortion and uniformity over 35 x 27 x 21cm. The phantom may be upgraded to the Magphan® RT 1230 model with the purchase of a center module (TMR008) to provide an extended FOV.

Magphan® RT 1230

The Magphan® RT 1230 can be configured for two different fields of view. The full three-piece configuration measures distortion and uniformity over 35 x 39 x 21 cm. By removing the central module, a smaller 35 x 39 x 21 cm FOV can be achieved.

The Magphan® RT’s modular design, when filled with solution, keeps all individual modules under 12 kg, enabling the phantom to be handled by a single person without special equipment. This design not only allows for easy handling of the phantom but also facilitates future system expansion with additional measurement modules.

PHANTOM ANALYSIS

The system measures the following imaging parameters:

Geometric Distortion

The locations of several hundred 1cm sphere fiducials are measured across the volume of the phantom. The measured locations are compared to known locations to generate a 3D distortion map. The phantom modules are designed to fit together precisely and the analysis accounts for any residual positional offsets between components. Beyond the distortion map the system tracks several key indicators such as maximum and mean high 10% distortion along the cardinal axes. Analysis of optimized gradient rescaling factors for different objectives is included

Uniformity

Uniformity can be a useful indicator for common failure mechanisms in subsystems like the RF coil element. The uniformity is measured at several hundred uniform spherical sub volumes throughout the phantom. The mean signal, normalized standard deviation and spread are calculated.

The Magphan® RT system measures the point spread function (PSF) and the modulation transfer function from circular features in the phantom all three measurement planes.

Signal-to-Noise Ratio

Signal-to-noise ratio is measured at several places throughout the phantom. Longitudinal tracking of SNR can give early warning of component degradation or failure.

Laser Alignment

The phantom contains markers for alignment with positioning lasers. The analysis provides data on translation and rotation of the phantom in all three cardinal axes.

ANALYSIS SERVICE

The included Magphan® RT analysis service is hosted by Image Owl Total QA® and is included in the purchase price for 2 years. The service provides the following benefits:

Completely Automated: Simply upload the complete DICOM scan series of the phantom. The service automatically identifies the features, performs the analysis and prepares the report. Analysis results are saved in the database for longitudinal studies, process control and inter-machine comparisons.

No Installation or Manual Updates: The service is accessible from any web enabled device and requires no local installation.. Updates to the service are automatic and require no user actions.

API Available: The Total QA® system includes an API that allows users to extend the system with custom analyses or interfaces.

Reporting, Trending and Data Analysis Included: The Total QA system provides an informative report, tracks all parameters over time and provides comparative analysis tools between machines.

Upgradeable to full Total QA system: The Magphan® RT analysis can be seamlessly integrated into a full Total QA system for managing all of a facility’s RT QA data.

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